The jQuery :contains() Selector is used to check whether a string contains a substring in jQuery.Set the substring you are searching for in the contains() method as shown below:$(document).ready(function(){    $("p:contains(Video)").css("background-color", "blue"); });Now, let us see the complete code to check whether a string contains a substring or not:Example Live Demo               $(document).ready(function(){          $("p:contains(Video)").css("background-color", "blue");       });     Tutorialspoint This is demo text. Free Tutorials Free Video Tutorials

To make a textarea and input type read only, use the attr() method .For readonly, set the input type text and textarea as read only as shown below:$('input[type="text"], textarea').each(function(){    $(this).attr('readonly','readonly'); });The following is the code to set readonly to textarea and input type:Example Live Demo jQuery Example               $(document).ready(function() {          $('input[type="text"], textarea').each(function(){             $(this).attr('readonly','readonly');          });       });     readonly textarea

fTo disable and enable checkbox, use the attr() method.Initially set the input type checkbox and disable it −MaleNow on the click of a button, toggle between disabled and enabled checkbox −$("#button1").click(function() {    $("#sName").attr('disabled', !$("#sName").attr('disabled')); });Example Live Demo jQuery Example               $(document).ready(function() {          $("#button1").click(function() {             $("#sName").attr('disabled', !$("#sName").attr('disabled'));          });       });     Male

We can easily disable input box(textbox,textarea) using disable attribute to “disabled”.$(‘elementname’).attr(‘disabled’,’disabled’);To enable disabled element we need to remove “disabled” attribute from this element.$(‘elementname’).removeAttr(‘disabled’);Example    ed                      $(document).ready(function () {             $('#btn1').click(function () {                $('input').attr('disabled', 'disabled');             });             $('#btn2').click(function () {                $('input').removeAttr('disabled');             });          });              Disable    Enable

The fadeTo( ) method fades the opacity of all matched elements to a specified opacity and firing an optional callback after completion.Here is the description of all the parameters used by this method −speed - A string representing one of the three predefined speeds ("slow", "def", or "fast") or the number of milliseconds to run the animation (e.g. 1000).opacity − A number between 0 and 1 denoting the target opacity.callback − This is optional parameter representing a function to call once the animation is complete.You can try to run the following code to learn how to work with fadeTo() method ... Read More

jQuery animate()The animate( ) method performs a custom animation of a set of CSS properties.Here is the description of all the parameters used by this method −params − A map of CSS properties that the animation will move toward.duration − This is optional parameter representing how long the animation will run.easing − This is optional parameter representing which easing function to use for the transition.callback − This is optional parameter representing a function to call once the animation is complete.You can try to run the following code to learn how to work with jQuery animate() method:Example Live Demo   ... Read More

To make jQuery animations smoother use the easing library. Use the animation speed properly to form it a perfect animation for the web page. Do not speed up animation and you should know where to stop it while using animate().For an example, set a button, that fades out on click and displays a textarea:Add answerThe following is the textarea that generates showing smoother animation using animation() and fadeout(): You can try to run the following code to make jQuery animation smoother:Example Live Demo               $(document).ready(function(){          $('body').on('click', '#answer', function() ... Read More

To change background color, use the mouseenter event. The background color change when you place mouse cursor:mouseenter: function(){    $(this).css("background-color", "gray"); }The mouse cursor is placed on the following element:Click and move the mouse pointer to change the background color.You can try to run the following code to learn how to animate a change in background color on mouseover:Example Live Demo               $(document).ready(function(){          $("body").on({             mouseenter: function(){                $(this).css("background-color", "gray");             },                 mouseleave: function(){                $(this).css("background-color", "red");             },              });       });        Click and move the mouse pointer to change the background color.

Use the hide() and show() method with animate() to hide and show elements.ExampleYou can try to run the following code to learn how to work with animate() method to hide and show elements:Live Demo $(document).ready(function(){     $("#btn1").click(function(){         $("#box").animate({height: "300px"}, 500, function() {            $(this).hide();         });     });    $("#btn2").click(function(){         $("#box").animate({height: "300px"}, 500, function() {            $(this).show();         });     }); }); Hide Show

jQuery show() methodThe show( speed, [callback] ) method shows all matched elements using a graceful animation and firing an optional callback after completion.Here is the description of all the parameters used by this method −speed − A string representing one of the three predefined speeds ("slow", "normal", or "fast") or the number of milliseconds to run the animation (e.g. 1000).callback − This is optional parameter representing a function to call once the animation is complete.ExampleYou can try to run the following code to learn how to work with show() method:Live Demo           The jQuery Example     ... Read More